“I don’t think we will survive another 1,000 years without escaping beyond our fragile planet,” Hawking said Tuesday during a talk at Britain’s Oxford University Union.

This isn’t the first time the theoretical physicist has insisted that humans figure out where our species is going to live next.

In January, during a lecture series at London’s Royal Institution, Hawking warned that developments in technology will lead to global cataclysm. He listed “nuclear war, catastrophic global warming, and genetically engineered viruses” as looming threats to our survival.